CN105070987A - Band-pass filter with adjustable C wave band - Google Patents
Band-pass filter with adjustable C wave band Download PDFInfo
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- CN105070987A CN105070987A CN201510475370.5A CN201510475370A CN105070987A CN 105070987 A CN105070987 A CN 105070987A CN 201510475370 A CN201510475370 A CN 201510475370A CN 105070987 A CN105070987 A CN 105070987A
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Abstract
The invention discloses a band-pass filter with an adjustable C wave band. The whole structure of the band-pass filter is composed of a cavity shell 1, input and output coupling structures 2, cavity bodies 3, inter-cavity coupling structures 4, tuning screws 5 and a cover board 6. Resonant cavities of the band-pass filter are in an inner-circle outer-circle coaxial cavity form; the asymmetrical resonant cavities are different in width dimension; the input and output coupling structures are in a coupling ring form; and the inter-cavity coupling structures are in a T-shaped window form. According to the band-pass filter, within a 600MHz frequency range of the C wave band, the design targets of a plurality of discrete frequency points as adjustable center frequencies, such as 4450MHz, 4550MHz, 4650MHz, 4750MHz, 4850MHz and 4950MHz, and invariable absolute bandwidth can be reached by only adjusting the lengths of the tuning screws 5. The filter has the characteristics of high stability, high productibility and the like, and is especially suitable for a communication system of which the C frequency band needs to be switched into a plurality of radio frequency transmission channels.
Description
Technical field
The present invention relates to a kind of C-band variable band-pass filter in the communications field, be specially adapted to the transmitting device in communication system radio-frequency channel.
Background technology
The microwave cavity band pass filter used in communication system at present, can be divided into tunable filter and fixed frequency range filter.
Fixed frequency range filter, its bandwidth sum centre frequency, by designing guarantee, immobilizes.
Tunable filter, in certain frequency range, by changing the frequency variable of filter, reaching and continuously changing centre frequency and object that bandwidth sum amplitude-frequency characteristic remains unchanged.Conventional tunable filter is generally motorized adjustment, and by driver element drive motor, motor drives the frequency adjustment variable of filter through transmission mechanism, and then adjustment centre frequency.As the large power, electrically tunable filter of patent No. CN02214418.8, be made up of parts such as watch-dog, power supply, motor, cylindrical cavity, interface waveguides, coupling screws, optical coupler, anti-dazzling screen, driver plate, ball-screw, piston, mountings.It adopts the position of the real-time control piston of watch-dog in cylindrical cavity to reach change frequency.
Summary of the invention
The object of the invention is to the technical foundation utilizing tunable filter, design a kind of fixed frequency range filter of special shape, adopt inner circle cylindrical coaxial cavity form, asymmetric cavity is selected different width dimensions and is adopted the measures such as T-shaped window coupled structure, realize within the scope of certain frequency, by means of only variable of adjusting frequency, when not changing coupled structure size, reach multiple discrete frequency regulable center frequency, the designing requirement that absolute bandwidth and amplitude-frequency characteristic remain unchanged.
The object of the present invention is achieved like this:
A kind of C-band variable band-pass filter, comprise chamber shell 1, input and output coupled structure 2, resonant cavity 3, coupled structure 4 between chamber, tuning plug 5 and cover plate 6, the left and right sidewall of chamber shell 1 is respectively equipped with input and output coupled structure 2, multiple resonant cavity 3 is disposed with along signal propagation direction between chamber shell 1 and cover plate 6, by coupled structure 4 cascade between chamber between adjacent resonators 3, inner wire and the tuning plug 5 relative with inner wire is provided with in each resonant cavity 3, it is characterized in that: multiple resonant cavity 3 becomes to be symmetrical arranged about chamber shell 1 center along signal propagation direction, the width dimensions of the resonant cavity of asymmetric setting is different, between chamber, coupled structure 4 is T-shaped window, T-shaped window is by longitudinal rectangular window and be positioned at longitudinal rectangular window top and the horizontal rectangular window orthogonal with longitudinal rectangular window forms, the width of the horizontal rectangular window of T-shaped window is less than the width of chamber shell 1, and the upper edge of the horizontal rectangular window of T-shaped window is concordant with chamber shell height.
Wherein, each resonant cavity 3 is cylindrical inner circle coaxial cavity form, and each input and output coupled structure 2 is coupling loop form.
Wherein, by adjusting the length of tuning plug 5, described variable band-pass filter, in C-band frequency range, realizes that the centre frequency of variable band-pass filter is variable, bandwidth is constant.
The present invention's tool compared with background technology has the following advantages:
1. adopt the Design and implementation method of fixed filters, there is processing technology simple, the feature of stable performance.
2. simplify the fixed filters design of the consistent multiple discrete frequency of bandwidth requirement in certain band limits, improve productivity, be conducive to standardization and the modularization of equipment.
Accompanying drawing explanation
The structural representation of Fig. 1 a kind of C-band variable band-pass filter of the present invention;
Fig. 2 variable band-pass filter A-A of the present invention cutaway view;
Fig. 3 variable band-pass filter B-B of the present invention cutaway view.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
For C-band 600MHz frequency, the chamber number n=9 of variable band-pass filter of the present invention, frequency range is 4400 ~ 5000MHz, and passband is wide is 100MHz, and centre frequency is respectively 4450MHz, 4550MHz, 4650MHz, 4750MHz, 4850MHz, 4950MHz.
As shown in Figure 1, C-band variable band-pass filter device of the present invention, is made up of the coupled structure 4 between chamber shell 1, input and output coupled structure 2, resonant cavity 3, chamber, tuning plug 5 and cover plate 6.
As shown in Figure 2, the resonant cavity 3 of variable band-pass filter device of the present invention is cylindrical inner circle coaxial cavity form, and inner circle outside diameter is respectively 6.86mm, 24.8mm, and resonant cavity height is 15.6mm, and each resonant cavity by the coupled structure between chamber separately.Asymmetrical resonant cavity width dimensions is different: the 1st chamber and the 9th chamber symmetry, and width dimensions is 22.24mm; 2nd chamber and the 8th chamber symmetry, width dimensions is 19.98mm; 3rd chamber and the 7th chamber symmetry, width dimensions is 20.55mm; 4th chamber and the 6th chamber symmetry, width dimensions is 20.65mm; 5th chamber width dimensions is 20.68mm.
Its input and output coupled structure 2 is coupling loop form, and coupling loop diameter is that the copper silver plated metals silk of 1mm realizes, and the rectangular dimension formed with chamber shell about 1 sidewall is 7.9mm × 8.75mm, and the limit parallel with chamber shell about 1 wall is 8.75mm.
As shown in Figure 3, between the chamber of variable band-pass filter device of the present invention, coupled structure 4 is T-shaped window shape formula, and its thickness is 0.6mm, and T-shaped window upper edge is concordant with chamber shell height.T-shaped window is divided into horizontal rectangle and vertical rectangle, and horizontal rectangle height dimension is 3.6mm, and width dimensions is wh
ij, wherein i, j represent the i-th chamber and jth chamber, wh
12=15.67mm, wh
23=14.34mm, wh
34=14.12mm, wh
45=14.05mm; Vertical rectangular elevation is of a size of h
ij, width dimensions is w
ij, h
12=10mm, h
23=10.4mm, h
34=11mm,
h45=11.4mm, w
12=7.3mm, w
23=5.95mm, w
34=5.55mm, w
45=5.5mm.
C-band variable band-pass filter device of the present invention, by adjusting the length of tuning plug 5, reaches centre frequency at 4450MHz in C-band 600MHz frequency range, 4550MHz, 4650MHz, 4750MHz, 4850MHz, 4950MHz are arbitrarily variable, and bandwidth keeps 100MHz constant.
Claims (3)
1. a C-band variable band-pass filter, comprise chamber shell (1), input and output coupled structure (2), resonant cavity (3), coupled structure (4) between chamber, tuning plug (5) and cover plate (6), the left and right sidewall of chamber shell (1) is respectively equipped with input and output coupled structure (2), multiple resonant cavity (3) is disposed with along signal propagation direction between chamber shell (1) and cover plate (6), by coupled structure (4) cascade between chamber between adjacent resonators (3), inner wire and the tuning plug relative with inner wire (5) is provided with in each resonant cavity (3), it is characterized in that: multiple resonant cavity (3) becomes to be symmetrical arranged about chamber shell (1) center along signal propagation direction, the width dimensions of the resonant cavity of asymmetric setting is different, between chamber, coupled structure (4) is T-shaped window, T-shaped window is by longitudinal rectangular window and be positioned at longitudinal rectangular window top and the horizontal rectangular window orthogonal with longitudinal rectangular window forms, the width of the horizontal rectangular window of T-shaped window is less than the width of chamber shell (1), and the upper edge of the horizontal rectangular window of T-shaped window is concordant with chamber shell height.
2. a kind of C-band variable band-pass filter according to claim 1, is characterized in that: each resonant cavity (3) is cylindrical inner circle coaxial cavity form, and each input and output coupled structure (2) is coupling loop form.
3. a kind of C-band variable band-pass filter according to claim 1 and 2, it is characterized in that: described variable band-pass filter, in C-band frequency range, realizes by the length of adjustment tuning plug (5) that the centre frequency of variable band-pass filter is variable, bandwidth is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475370.5A CN105070987B (en) | 2015-08-05 | 2015-08-05 | A kind of C-band variable band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475370.5A CN105070987B (en) | 2015-08-05 | 2015-08-05 | A kind of C-band variable band-pass filter |
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| CN105070987A true CN105070987A (en) | 2015-11-18 |
| CN105070987B CN105070987B (en) | 2019-04-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229592A (en) * | 2016-09-20 | 2016-12-14 | 中国电子科技集团公司第五十四研究所 | A kind of low-frequency range cavity band-pass filter |
| CN106876848A (en) * | 2017-02-17 | 2017-06-20 | 北京德是和科技有限公司 | A kind of wave filter |
| CN111261981A (en) * | 2018-11-30 | 2020-06-09 | 诺基亚通信公司 | Resonator for radio frequency signals |
| CN113451724A (en) * | 2020-03-26 | 2021-09-28 | 诺赛特国际有限公司 | Cavity filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030206082A1 (en) * | 2002-05-06 | 2003-11-06 | Chen Ming Hui | Waveguide filter with reduced harmonics |
| CN101656340A (en) * | 2009-09-14 | 2010-02-24 | 杭州电子科技大学 | Coaxial cavity tunable filter with balanced bandwidth at high end and low end |
| CN103985934A (en) * | 2013-02-08 | 2014-08-13 | Ace技术株式会社 | Mixed-mode cavity filter |
| CN204809367U (en) * | 2015-08-05 | 2015-11-25 | 中国电子科技集团公司第五十四研究所 | Adjustable band pass filter of C wave band |
-
2015
- 2015-08-05 CN CN201510475370.5A patent/CN105070987B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030206082A1 (en) * | 2002-05-06 | 2003-11-06 | Chen Ming Hui | Waveguide filter with reduced harmonics |
| CN101656340A (en) * | 2009-09-14 | 2010-02-24 | 杭州电子科技大学 | Coaxial cavity tunable filter with balanced bandwidth at high end and low end |
| CN103985934A (en) * | 2013-02-08 | 2014-08-13 | Ace技术株式会社 | Mixed-mode cavity filter |
| CN204809367U (en) * | 2015-08-05 | 2015-11-25 | 中国电子科技集团公司第五十四研究所 | Adjustable band pass filter of C wave band |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229592A (en) * | 2016-09-20 | 2016-12-14 | 中国电子科技集团公司第五十四研究所 | A kind of low-frequency range cavity band-pass filter |
| CN106876848A (en) * | 2017-02-17 | 2017-06-20 | 北京德是和科技有限公司 | A kind of wave filter |
| CN106876848B (en) * | 2017-02-17 | 2019-04-23 | 北京德是和科技有限公司 | A kind of filter |
| CN111261981A (en) * | 2018-11-30 | 2020-06-09 | 诺基亚通信公司 | Resonator for radio frequency signals |
| US11121445B2 (en) | 2018-11-30 | 2021-09-14 | Nokia Solutions And Networks Oy | Resonator for radio frequency signals |
| CN111261981B (en) * | 2018-11-30 | 2021-11-12 | 诺基亚通信公司 | Resonator for radio frequency signals |
| CN113451724A (en) * | 2020-03-26 | 2021-09-28 | 诺赛特国际有限公司 | Cavity filter |
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| Publication number | Publication date |
|---|---|
| CN105070987B (en) | 2019-04-26 |
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